You d have to check with your state s Board of Health to find out what the regulations are for selling food. Most states don t let you use your home kitchen for commercial products, so the first thing you ll need to do is find a kitchen to rent to make whatever it is you re planning to sell. There are also specific laws about how you have to label food for sale -- again, this depends on your state regulations as well as federal ones.Your state s Web site would be the first place to start. They can probably advise you what to do next.
http://home.ivillage.com/homeoffice/homeoff/0,,p3tq,00.html
Go to LegalZoom.com It will tell you what to do.
You re not going to make a fortune off of it, just ask a friend or someone if they want to buy it.